Hi there, I have a customer who has a Aux heat pump, Model : AC-KFR53 that is not running correctly.

Basiclly it starts on heating and only runs for about 30 seconds before cutting out. The timer light then flashes.

The refrigerant charge is fine, compresser current ok, and fan operation appears good.

I am unable to locate a service manual for this type of unit, has anyone dealt with this type or unit or fault or has any ideas to what may be causing it to cut out.

Cheers.